This is my first build Nocturne. With this build you can be legendary very quickly and effortlessly. I hope you enjoy it.

Before Nocturne, people believed that dreams were figments of their imagination, meaningless images that flashed through the mind when one slept. This belief was put to the test when a rash of sleep-related incidents started afflicting summoners of the League. Some would wake up screaming, terrified and beyond consolation. Some could not fall asleep, slowly going mad as the nights ticked by. Some simply never woke up. Physicians were baffled until a Field Architect happened to pass out next to a nexus on Twisted Treeline. Witnesses said he cried out once and then stopped breathing. Immediately after, magical energy arced out from the nexus, and Nocturne appeared.

Nocturne did not take his introduction to this world kindly. He slaughtered everything he could find before summoners were able to magically confine him. After a period of intense study, League experts divined that Nocturne hunted summoners in their sleep, attacking them in a place where their magic was useless. This seemed to be his only purpose. The families of the victims demanded justice, but League officials were concerned that death might only return Nocturne to the place from which he came. They bound him to a nexus fragment, trapping him in the physical world. As punishment for his crimes, they allowed summoners to call upon Nocturne in the League matches, bending his will to the summoners he hates and creating his own personal nightmare. League scholars don't know whether he truly came from the plane of dreams, or whether there are any more like him. Some theorize that the summoning act affected summoners' subconscious minds, luring Nocturne to them in their sleep. Perhaps the most disturbing theory is that Nocturne is a person's nightmare come to life. If this is true, they wonder, who is the dreamer?

''The darkness is closing in...it's pitch black now...but I can still see him...''
- Kelvin Ma, patient #4236

Duskbringer - Nocturne throws a shadow blade which deals damage, leaves a Dusk Trail, and causes champions to leave a Dusk Trail. While on the trail, Nocturne ignores unit collision and has increased Movement Speed and Attack Damage.
Nocturne throws a shadow blade which deals 60/110/160/210/260 (+) physical damage and leaves a Dusk Trail for 5/5/5/5/5 seconds. Enemy champions hit also leave a Dusk Trail.

While on the trail, Nocturne ignores unit collision and gains 15/20/25/30/35% Movement Speed and 20/30/40/50/60 Attack Damage.
Cost
60/65/70/75/80 Mana
Range
1200

Shroud of Darkness - Nocturne empowers his blades, passively gaining attack speed. Activating Shroud of Darkness allows Nocturne fades into the shadows, creating a magical barrier which blocks a single enemy spell and doubles his passive attack speed if successful.
Passive: Nocturne has 20/25/30/35/40% bonus Attack Speed.

Active: Nocturne creates a magical barrier for 2 seconds, which blocks the next enemy ability.

If an ability is blocked by the shield, Nocturne's passive Attack Speed bonus doubles for 5 seconds.
Cost
50/50/50/50/50 Mana
Range
20

Unspeakable Horror - Nocturne plants a nightmare into his target's mind, dealing damage each second and fearing the target if they do not get out of range by the end of the duration.
Nocturne plants a nightmare into his target's mind, dealing 50/100/150/200/250 (+1) magic damage over 2 seconds. If Nocturne stays within 600 range of the target for the full duration, the target becomes feared for 1/1.25/1.5/1.75/2 second(s).
Cost
60/65/70/75/80 Mana
Range
500

Paranoia - Nocturne reduces the sight radius of all enemy champions and removes their ally vision in the process. He can then launch himself at a nearby enemy champion.
Nocturne reduces the sight radius of all enemy champions and removes their ally vision for 4 seconds.

While Paranoia is active, Nocturne can launch himself at an enemy champion, dealing 150/300/450 (+) physical damage.
Cost
100/100/100 Mana
Range
2000

Umbra Blades - Every 10 seconds, Nocturne's next attack strikes surrounding enemies for 120% physical damage and heals himself for 15/20/25 per target hit.

Nocturne's basic attacks reduce this cooldown by 1 second.

Almost all the runes to Nocturne on attack speed, because it is a character that deals a lot of damage, and attacks very quickly.

Almost all masteries are added to the offense, which only helps Nocturne.

All items are for the Nocturne those that give a lot of mega-attack speed and damage.

At the beginning add to 1 skill, then to 2 and 3, then 1 and 3 maxing skills, and ulti.
The third skill leave at the end.

Ghost and exhaust are the best choice for Nocturne, because this ghost +
1 skill, Nocturne has great speed and if you exhaust and nobody will escape.

When I play this build, I always have at least seven kills. I think you are too!

Regards, Deadviner.